I’ve seen this on a few repos and it never came across too harsh, the posts tagged with it were deserving. Wish I’d noted the repo names…

I’m fine with it tbh. FOSS devs need to squeeze every bit of enjoyment out of working on the project to keep motivated. If they (or mods) can drop a helpful reply and close an issue as ‘skill issue’ and get a little chuckle while they give their time for free answering poorly-written queries or bad bug reports then that’s a reasonable trade to keep them from burning out.